hexter-dssi - DSSI software synthesizer plugin emulating DX7

hexter is a software synthesizer that models the sound generation of a
Yamaha DX7 synthesizer. It can easily load most DX7 patch bank files,
accept patch editing commands via MIDI sys-ex messages (ALSA systems
only), and recreate the sound of the DX7 with greater accuracy than
any previous open-source emulation (that the author is aware of....)
hexter operates as a plugin for the Disposable Soft Synth Interface
(DSSI). DSSI is a plugin API for software instruments (soft synths)
with user interfaces, permitting them to be hosted in-process by audio
applications.